Someone recommended I change this:

mysqldump --add-drop-table -uroot -ppassword dbname >
/path/to/database/dbname_sql.txt

To this:

mysqldump --opt -uroot -ppassword dbname >
/path/to/database/dbname_sql.txt

Saying that --opt adds a few more things into the backup. What is the difference between these two methods of backing up the database?

Jason